Multiple choice quesction 10 science

Q 1. Choose the incorrect statement We are encouraged to plant more trees so as to ensure clean environment and also provide biomass fuel Gobar-gas is produced when crops, vegetable wastes, etc., decompose in the absence of oxygen The main ingredient of biogas is methane and it gives a lot of smoke and also produces a lot of residual ash. Bio-mass is a renewable source of energy Q 2. Which power plant uses coal to generate electricity? Hydro Power plant Nuclear Power Plant Thermal Power Plant Biogas Power Plant Q 3. The use of charcoal is discouraged even though it is a better fuel than coal, because: charcoal is prepared from destructive distillation of wood Charcoal burns with flames coal has a higher heat generation efficiency coal burns comparatively with less smoke Q 4. The material used for making solar cells is Silver Gold Silicon Copper Q 5. What is the major problem in harnessing nuclear energy? Splitting of the nuclei Duration...

Q 1. The function of commutator or slip ring in a motor is to increase the current flowing through the coil decrease the current flowing through the coil change the direction of current through coil change the direction of magnetic field Q 2. By which instrument the presence of magnetic field can be determined? Magnetic needle Galvanometer   Ammeter Voltmeter Q 3. A beam of alpha particles enters a chamber moving along the magnetic field. The force acting on them is Maximum and perpendicular to the magnetic field Maximum and along the magnetic field Minimum and perpendicular to the magnetic field Zero Q 4. The potential difference maintained between the live wire and neutral wire in India is 240 V 220 V 440 V 420 V Q 5. In Fleming's left-hand rule, which finger points in the direction of the magnetic field? Thumb Index finger Middle finger None of the above Q 6. Strength of induced current is increased when Number of turns ...